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Question
Name or state following with reference to the element of the first three periods of the periodic table.
The formula of the hydroxide of the element having electronic configuration 2, 8, 2.
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Solution
Hydroxide of element [2, 8, 2] is Mg [OH], where Mg is the element.
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RELATED QUESTIONS
Name any two elements of group one and write their electronic configurations. What similarity do you observe in their electronic configurations? Write the formula of oxide of any of the aforesaid elements.
Based on the group valency of elements state the formula lot the following giving justification for each :-
(i) Oxides of 1st group elements,
(ii) Halides of the elements of group 13, and
(iii) Compounds formed when an element of group 2 combines with, an element of group 16.
Define the term : Valency
An element X belongs to group 2 and another element Y belongs to group 15 of the periodic table:
(a) What is the number of valence electron in X?
(b) What is the valency of X?
(c) What is the number of valence electrons in Y?
(d) What is the valency of Y?
Explain how you have arrived at your answers.
Fill in the blank:
on moving from right to left in the second period, the number of valence electrons……….
Select the correct answer
Identify the metalloid
In the above table, H does not represent hydrogen.Some elements are given in their own symbol and position in the periodic table while others are shown with a letter. With refrence to the table answer the following questions.
1. Identify the most electronegative element.
2. Identify the most reactive element of Group I.
3. Identify the element from Period 3 with least atomic size.
4. How many valence electrons are present in Q?
5. Which element from group 2 would have the least ionisation energy?
6. Identify the noble gas of the fourth period.
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Arrange the following as per instruction given in the bracket.
Cl, F, Br, I (increasing electron affinity)
Name and state the following with reference to the elements of the first three periods of the periodic table.
Metalloid in Period 3.
The electronic configuration of an element is 2, 8, 4. State it:
group and period in the Modern Periodic Table.
